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Agree, long long every two weeks and short long ones every other weekend, but back to back 22s will be counter-productive.
20 in 2:42? Shouldn't you be looking at more like sub 3:30? Either that or you're doing your long runs too fast.As for the longer runs - depends. ie how long you've been running, what your weekly mileage is, how well you recover etc etc.Eg a couple of years ago for my 2nd mara I would have done 16 then 20 or possibly 22. Now after more marathons and a couple of ultras and min 50 mpw even when not event specific training I would do 2x22 as I know I'll recover well and 20 milers are not as challenging.